How hard is it to install an infrared sauna?

Most prefab infrared saunas are straightforward to install. Two people can usually assemble a 1- to 2-person cabin in a few hours with basic tools, because the walls, floor and roof arrive as pre-wired panels that clip or bolt together. The main requirement is a suitable outlet or dedicated circuit that matches the cabin's voltage and amperage.

Do you need an electrician to install a sauna?

For a traditional electric sauna, yes. Heaters of roughly 4.5-9 kW normally need a dedicated 240V circuit, hard-wiring and often a permit, which a licensed electrician should handle. Many small 120V infrared saunas simply plug into a dedicated 15A or 20A outlet, though you may still need an electrician to add that outlet.

Can you install a sauna in your home?

Yes. Common indoor locations are basements, garages, spare rooms and large bathrooms. You need a level floor that tolerates moisture, enough space for the cabin plus clearance for doors and ventilation, and the right electrical supply. Traditional saunas also need intake and exhaust vents and a heater placed to the manufacturer's clearances.

What do you put under an outdoor sauna?

An outdoor sauna needs a level, well-drained base that keeps the wood off the ground. Common options are a concrete slab, concrete pavers, compacted gravel with timber bearers, or a raised deck rated for the load. Barrel saunas usually sit on cradles that rest on the base. Avoid placing the sauna directly on soil or grass.

What affects infrared sauna installation cost?

The biggest installation cost drivers are electrical work, delivery access and site preparation. A plug-in 120V cabin in a ready room may cost little beyond your time, while a 240V model that needs a new circuit, a long cable run or panel upgrade costs more. Outdoor models add foundation, trenching and weatherproofing costs.

How much space do you need around a sauna?

Leave enough room to assemble the panels, open the door fully and reach the electrical connection, usually at least a few inches behind and above the cabin and more where the manual specifies. Traditional heaters have their own minimum clearances to walls, benches and ceiling, which must follow the heater manufacturer's installation instructions.

Sauna Installation: Indoor, Outdoor and Infrared Steps

Short answer. Sauna installation comes down to four jobs: choosing a level, dry site, providing the right electrical supply, planning ventilation, and assembling the cabin to the manufacturer's instructions. A prefab infrared sauna is often a two-person, few-hour job with a plug-in or dedicated circuit. Traditional and outdoor saunas take more planning because they need 240V hard-wiring or a wood stove, vents, heater clearances and, outdoors, a proper foundation.

Which type of sauna installation are you planning?

The steps differ a lot by type. Use this table to see where your project sits before you buy.

Installation type	Typical power	Ventilation	Base	Who usually installs
Indoor infrared (prefab)	120V plug-in or 240V hard-wired	Built-in roof vent; room airflow	Existing level floor	Owner, plus electrician if a new circuit is needed
Indoor traditional (prefab or custom)	240V dedicated circuit, heater about 3.5-9 kW	Intake low near heater, exhaust high or under bench	Moisture-tolerant floor	Owner or carpenter, plus licensed electrician
Outdoor electric (barrel, cube, cabin)	240V run from house panel, outdoor-rated	Intake and exhaust vents in shell	Slab, pavers, gravel or deck	Owner or contractor, plus electrician
Outdoor wood-burning	None for heat (optional lighting)	Vents plus chimney	Non-combustible hearth area	Owner or contractor; chimney per code
Steam room	Steam generator, often 240V	Sealed room, exhaust fan	Waterproofed floor with drain	Contractor, plumber and electrician

A steam sauna installation is a wet-room build with waterproofing, a sloped ceiling and a floor drain, which is a different project. See our home steam room guide if that is your plan.

Before you install a sauna: planning checklist

Measure the room and the route in. Check door widths, stair turns and ceiling height; panels must fit through.
Confirm the floor is level and can handle occasional moisture: concrete, tile or vinyl are common. Avoid carpet under a traditional sauna.
Plan power first. Note the cabin's voltage, amps and whether it plugs in or must be hard-wired. Use our sauna power calculator to check circuit size.
Allow clearance behind and above the cabin for assembly, the control box and ventilation, plus room for the door to swing fully.
Check codes and permits. Electrical work usually needs a permit. In California, for example, the Mechanical Code section 939.1 requires that electric sauna heaters comply with UL 875 and are installed according to the manufacturer's instructions.
Check listings. In North America, look for heaters and cabins listed by a recognized testing lab (for example ETL). Internationally, IEC 60335-2-53 covers sauna heating appliances and infrared cabins up to 20 kW.

How to install an infrared sauna indoors

Infrared sauna assembly is the simplest of all installation types. Most indoor cabins ship as flat-packed, pre-wired panels that connect with buckles, clips or bolts. The sequence below is typical, but always follow your model's manual.

Unpack and check parts against the packing list. Lay panels on cardboard to protect the wood.
Place the floor panel in its final position, leaving the clearance the manual calls for behind it.
Stand the back wall on the floor, then add the side walls and lock them together.
Fit the bench and any lower heater panels; many benches slide into side rails.
Install the front wall and door. Check that the door closes square and the seal meets the frame.
Lower the roof panel onto the walls, feeding heater and lighting cables through the roof openings as you go.
Connect the wiring at the roof junction box using the labeled plugs. Do not cut or extend factory cables.
Plug in or connect to the dedicated circuit, then run a first heat cycle for 30-60 minutes with the door open to let any new-wood smell dissipate.

Two people can usually finish a 1- to 2-person cabin in a few hours. Larger 4- to 6-person and corner models take longer because of their size and extra panels; a corner sauna installation also needs both room walls to be reasonably square.

What power does an infrared sauna need?

Small cabins often run on 120V. A 1,650 W cabin draws about 13.75 A at 120V, which is why most manufacturers ask for a dedicated 15A or 20A outlet rather than a shared circuit. Larger cabins are often 240V and hard-wired. Electrical work in the US follows the National Electrical Code (NFPA 70) plus local amendments. Our sauna electrical requirements guide explains 110-120V vs 220-240V in detail.

Traditional sauna installation

A traditional sauna installation adds three things that infrared cabins rarely need: a high-power heater circuit, correct heater clearances and a planned vent path.

Electrical

Electric sauna heaters usually range from about 3.5 kW for small rooms to 9 kW or more for large ones. The current is simple to estimate: a 6 kW heater at 240V draws 6,000 / 240 = 25 A. Electricians commonly size circuits for heaters that run for long periods at 125% of their load, and the heater manual will state the required breaker and wire size. This is licensed-electrician work in most places. UL 875, the US standard for electric dry-bath heaters, covers the heater and its controls, so use a listed heater and control together as specified.

Heater placement and clearances

Mount the heater where the manual says, usually near the door wall so incoming air passes over it. Keep the minimum clearances to walls, ceiling and benches stated by the heater maker, and install the heater guard rail. Never put a heater under a bench unless it is designed for that.

Ventilation

Fresh air usually enters low near the heater and exhausts high on the opposite wall or under a bench, depending on the design. Our sauna ventilation guide shows common layouts. For a custom room built inside your house, insulation and a foil vapor barrier on the warm side matter as much as the heater; see sauna insulation and vapor barrier.

Heater size	Typical room volume	Current at 240V	Notes
3.5 kW	Small 1-2 person rooms	About 14.6 A	Check if 208V service changes output
4.5 kW	2-3 person rooms	About 18.8 A	Common for home cabins
6 kW	3-4 person rooms	25 A	Popular all-round size
8-9 kW	Large family or light commercial	About 33-38 A	Often needs a larger panel capacity

Room volume ranges vary by insulation, glass area and ceiling height, so follow the heater maker's sizing chart.

Outdoor sauna installation

Outdoor sauna installation is mostly about the base, the power run and weather protection.

Foundation

Build a level, well-drained base that keeps wood off the soil: a concrete slab, concrete pavers, compacted gravel with treated timber bearers, or a deck rated for the load. Barrel saunas sit on cradles; cube and cabin saunas need full perimeter support. Allow for the weight of the structure, heater, stones and occupants.

Power or fuel

Electric models need an outdoor-rated cable run from your main panel, often in buried conduit, with a disconnect where local code requires it. Wood-burning models need no electricity for heat, but the stove, chimney and clearances must meet NFPA 211, the US standard for chimneys and solid fuel-burning appliances, and local codes. The EPA's Burn Wise program offers guidance on certified wood heaters and cleaner burning. Our wood-burning sauna stove guide covers chimney kits and heat shields.

Weatherproofing

Fit the roof covering supplied (shingles, membrane or metal), tighten barrel bands seasonally as the wood moves, and seal or treat exterior wood as the maker recommends. Keep vents clear of snow and leaves.

Infrared sauna installation cost and installation services

We do not quote installation prices, because costs vary so much by region and site. The main cost drivers are:

Electrical work: none for a plug-in model with an existing outlet; more for a new dedicated circuit, long cable runs or a panel upgrade.
Delivery access: stairs, narrow doors or crane lifts for large outdoor saunas.
Site preparation: slab or paver base, trenching for cable, drainage.
Labor: DIY assembly versus a sauna installation service or general contractor.
Permits and inspections: electrical permits are common; wood stoves may need building approval.

Get a written quote from a licensed electrician before you buy, especially for 240V models.

Planning a project for resale or hospitality?

Mars Sauna supplies indoor infrared, traditional electric-stove and outdoor barrel and cube saunas in 110-120V or 220-240V builds, with many models listing CE and ETL. Browse our outdoor saunas or request a quote with your voltage, size and site details.

Key takeaways

Sauna installation means site, power, ventilation and assembly; plan the electrical supply before you buy.
Most prefab infrared saunas install in a few hours with two people and a dedicated 120V or 240V supply.
Traditional saunas need a 240V dedicated circuit sized to the heater manual, correct heater clearances and planned vents; a 6 kW heater draws 25 A at 240V.
Outdoor saunas need a level, drained foundation, an outdoor-rated power run or a code-compliant chimney for wood stoves.
Use listed heaters (UL 875 in the US, IEC 60335-2-53 internationally) and follow the manufacturer's instructions.